![lensescompare [Canon 18 200mm] Canon 18 200 IS or Tamron 18 270 VC](http://www.howtobuycameralenses.com/wp-content/uploads/2009/07/lensescompare.jpg "lensescompare")
If you have a so-called Reisezoom with a 11-times the focal length range to buy, who knows that this is not the same picture quality as normal, or even zoom lenses can provide fixed focal lengths. Chromatic aberration and distortion are also necessarily larger. That saves a Megazoom frequent lens changes, not only while traveling can be very annoying.
Interesting for me was it only the question of what is currently offered travel zoom is better? I have, therefore, the “Canon EF-S 18-200mm F / 3,5-5,6 IS“ and “Tamron AF18-270mm 3.5 / 6.3 Di II VC“ extensively tested (test boards and landscape), and both lenses compared.
The result is – for me at any rate – is clear: The winner is Canon! Particularly with regard to sharpness and contrast is that over the entire zoom range better than the just available Tamron.
![canon18200 [Canon 18 200mm] Canon 18 200 IS or Tamron 18 270 VC](http://www.howtobuycameralenses.com/wp-content/uploads/2009/07/canon18200.jpg "canon18200")
Only in the vignetting the Canon in the range above 100mm. This Randabschattung in the corners at open aperture is 5.6 clearly visible. In Dimmer to 7.1 will be noticeably lower. Only in this discipline is better then the Tamron, though it is in the high focal length range visible shading shows, but it is lower.
Color bleeding (chromatic aberration) are of course as with all travel in the image zoom on edge. Even when Canon lens are visible through dim and not be reduced. They occur only in the horizontal direction, while the Tamron both horizontal and vertical color bleeding generated.
The distortion correspond to those of other mega-zooms, ie strong barrel 18mm, from 35mm then easily pincushion. For photographs of architecture in the short focal length range is possibly a lens or a change is necessary after treatment with an image editing program.
Conclusion: As a universal or Reisezoom is the Canon EF-S 18-200mm F / 3,5-5,6 IS “good. It delivers sharp, high contrast images throughout the zoom range. Optimal is a dim to one to two stages. Then, the vignetting disappears in about 100mm, which could disrupt landscape photographs. For strongly zoomed persons or animal shots anyway, this does not occur.
The focus on work reliably, the image stabilizer is a great thing.
![tamron18270 [Canon 18 200mm] Canon 18 200 IS or Tamron 18 270 VC](http://www.howtobuycameralenses.com/wp-content/uploads/2009/07/tamron18270.jpg "tamron18270")
The Tamron AF18-270mm 3.5 / 6.3 Di II VC “has a greater zoom range, and quite acceptable values. It cuts, but in my tests (on a Canon 40D) worse. And one can also say: There is a class better than the “old” Tamron-Megazoom (without stabilizer), the AF18-200 4.5 / 6.3 XR Di II “.
But: Both lenses were from me to a Canon 40D tested. Only applies to these reviews. It may be that the Tamron on a Nikon better results. Current test reports seem to confirm this.
But unfortunately must Tamron 18-270mm or something negative to be mentioned. The designers is a misfortune happens: if you zoom down – for example, an object close to the ground to photograph – so blocking the zoom ring. Nothing is more, the zoom can be in this position no longer move. Actually, a disgrace. There is a need to repair and hopefully possible.
translated from amazon.de customer review.
